Rotary cutter-head



PATENTED FEB. 9, 1904..

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No. v5i,952. PATENTED FEB. 9,1904.

E. s. SHIMBR. ROTARY CUTTER HEAD.

APPLIGATION FILED JULY 20, 1903.

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' N0 MODEL.

UNITED STATES Patented February 9, 1904.

ELMER S. SHIMER, OF MILTON, PENNSYLVANIA.

ROTARY CUTTER-HEAD.

SPECIFICATION forming part of Letters Patent No. 751,952, dated February9, 1904..

Application filed July 20, 1903.

. zen of the United States, residing at Milton,

in the county of Northumberland and State of Pennsylvania, have inventednew and useful Improvements in Rotary Cutter-Heads, of which thefollowing is a specification.

My invention relates to improvements in rotary cutter-heads, moreespecially for jointing the edges of lumber for glue-produced joints andlike work, as where flat or straight surfaces are desirable.

It contemplates the improving of that type or class of cutter-headknives or cutters arranged diagonally or in an inclined position to theaxial plane of the cutter-head, while it is equally applicable to suchknives or cutters otherwise arrauged-as, for instance, parallel withsaid axial plane,wherein the edge of the knife from one end upward ordownward engages or begins to cutthe material in advance of the otherportion of such edge as the carrying-head revolves, said knife thusgradually producing the cut, shearing upwardly or downwardly, accordingto the pitch or inclination of the knife. Among other advantages of theaforesaid cutting action it may be noted that a smoother finish than isotherwise obtainable is thus produced, consequently the turning out of abetterclass of work. In cutter-heads of this description it is desirableto have the knives to project to the extreme upper and lower limits ofthe head and in some instances even beyond those points, the space forwhich in many machines of this character, however, is limited orprescribed within certain measurements or bounds.

The object of such contemplated improvement is to firmly or solidly holdthe knives in working position and to effect this purpose, together withthe holding of the component parts of the knife-carrying head, in asubstantial way.

The nature of my invention consists of means for carrying out said ends,substantially as hereinafter more fully described, and specificallypointed out by the claims concluding the following description.

In the accompanying drawings, illustrating the preferred embodiment ofmy invention,

Serial No. 166,342. (No model.)

Figure l is a side elevation thereof. Fig. 2 is a vertical section takenin the oblique plane of a cutter or knife. Fig. 3 is a plan view. Fig. 4is an inverted view of the upper cutter-head member. Fig. 5 is a planview of the lower member of said head. Fig. 6 is a horizontal sectiontaken centrally about of the cutter-head, including the cutter or knife.Fig. 7 is a front elevation of my cutter-head. Fig. 8 is a view of oneof my knives. Fig. 9 is a cross-section through a knife blank orcylinder.

In practicing my invention I constitute the cutter-head proper, 1, oftwo members 1 1 the lower one preferably being produced in general of acircular or disk-like base 1", with an upper tubular extension or sleeve1 having, preferably, trunnion-like lateral elongations, and directlyabove these latter said tubular extension or sleeve is formedwithashoulder 1 by reducing the same diametrically. The upper'member ofsaid cutter-head, also of general disk-like conformation, has a centraltubular collar-like portion 1 facing downwardly and fitting or slippedupon the tubular portion or sleeve 1 of the lower member.

The details of construction thus far described I are of no particularmoment as relates to the material points of my invention. and lowermembers are provided with segmental cutter-receiving recesses or seats 22", respectively, the special dip or inclination of which, as relates tothe plane of rotation of the heads or cutters, constituting, however, nofeature in particular thereof so far as the claims set up herein areconcerned. These seats have produced around their arcuate surfacesshoulders or offsets 3 3, respectively, facing upwardly and downwardlyor oppositely to each other, the purpose of which will presently appear.Said offsets or shoulders conform in inclination or dip to the diagonalposition the cutters or knives are designed to occupy, later described,and preferably are of an undercut or dovetailed character, as shown, thefunction of which will be seen hereinafter.

The cutters or knives 4, as above noted, are arranged in a pronounceddiagonal position purposely to effect a shear cutting action upon thematerial treated, each two being prefer- Said upper ably produced from acommon cylinder of toolsteel forging bored out and reamed its full orentire length, said cylinder being then cut in two through itslongitudinal center, each half thereof thus forming a knife or cutter,said cylinder being also previously formed of considerable thickness incross-section the greater portion of its length and reduced shortdistances from its ends. Said knives or cutters are each thus producedin like manner, as said cylinder is split longitudinally, it abovenoted. By this construction each knife or cutter is thus formed with ashoulder 4: near each end, said shoulder being inclined to conform orcorrespond to the inclination of the shoulders or offsets 3 3 of theupper and lower member cutter-receiving seats. Said shoulders or offsets4 are also of a dovetailed or undercut construction to interlock orinterfit into the shoulders or offsets of said upper and lower membersof the cutter-head. This construction has a twofold effect first', topermit of the solid or firm locking of the knives and cutterheadstogether as they are brought or bolted forcibly together and also toallow said cutters to extend the full length of the cutter-head at theirends or even beyond the limits of said head, if desired. Said knives orcutters are each formed along one edge from the inner surface with thecutting edge to bring the same prominently forward to perform themaximum cutting action and which edge projects an equal or uniformdistance throughout from the axis of the cutter-head.

The bolts 7 connecting together and passing through the upper and lowermembers of the cutter-head are disposed close to and at the rear of andcorrespondingly inclined with the cutters or knives, the lower,preferably flat-headed, ends of said bolts being countersunk into saidlower member and the upper ends of said bolts being held in place bynuts bearing upon said upper member. I The bolts, as stated, having acorresponding inclination with said knives and bearing similarly uponsaid lower member as well as connected up in like manner with said uppermember, effect,

together with the corresponding bearing afforded by the offsets orshoulders between said knives and upper and lower members, a solid andunyielding connection between said parts. It is also obvious that theshoulders or offsets on the knives and in the knife-seats in said upperand lower members of the cutter-heads may be produced on lines whichwould allow said knives to be arranged parallel with the axis of thecutter-head in cases requiring such arrangement thereof.

It will be observed that I do not limit myself to details herein, asthey may be changed as circumstances suggest without departing from thespirit of my invention and said invention still be. protected.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is

1. Acutter-head knife having upon its back portion, near the ends,segmental shoulders or offsets, said shoulders or offsets being arrangedin diagonal planes, and engaging corresponding shoulders upon thecutter-head, and adapted to allow said knife to extend the full lengthof said head, and means to hold said knife in operative position.

2. A cutter head having segmental seats opening therethrough and havingshoulders arranged in diagonal planes around said seats, and a segmentalcutter having upon its back portion, near the ends, correspondingshoulders, also arranged in diagonal planes and engaging the aforesaidshoulders, said cutter being arranged in said seats, permitting it toextend the full length of said cutter-head, and means to retain saidcutter in said head for effective action.

3. A cutter-head having its flanges provided with semicircular openingsor seats and with shoulders around said seats or openings, and a knifeor bit having its inner semicylindrical surface forming the cuttingedge, and its exterior convex surface provided near the ends thereofwith shoulders engaging the aforesaid openings and shoulders of'saidflanges, respectively.

4. A cutter-head having its flanges provided with semicircular openingsor seats,and with shoulders around said seats or openings, and asemicylindrical cutter or hit having its plain inner surface adapted toserve as the cutting edge, and whose end portions are of lesscrosssectional area or thinner than its central body portion thusforming shoulders, said thin end portions and shoulders interlockingwith the shoulders and seats of said flanges.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

ELMER S. SHIMER.

Witnesses:

W. BRUCE CLINGER, C. E. RAUP.

